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| Mirrors > Home > MPE Home > Th. List > scutfo | Structured version Visualization version GIF version | ||
| Description: The surreal cut function is onto. (Contributed by Scott Fenton, 23-Aug-2024.) |
| Ref | Expression |
|---|---|
| scutfo | ⊢ |s : <<s –onto→ No |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | scutf 27788 | . 2 ⊢ |s : <<s ⟶ No | |
| 2 | lltropt 27852 | . . . . 5 ⊢ ( L ‘𝑥) <<s ( R ‘𝑥) | |
| 3 | df-br 5098 | . . . . 5 ⊢ (( L ‘𝑥) <<s ( R ‘𝑥) ↔ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ) | |
| 4 | 2, 3 | mpbi 230 | . . . 4 ⊢ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s |
| 5 | lrcut 27884 | . . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥) | |
| 6 | 5 | eqcomd 2741 | . . . 4 ⊢ (𝑥 ∈ No → 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 7 | fveq2 6833 | . . . . . 6 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉)) | |
| 8 | df-ov 7361 | . . . . . 6 ⊢ (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉) | |
| 9 | 7, 8 | eqtr4di 2788 | . . . . 5 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 10 | 9 | rspceeqv 3598 | . . . 4 ⊢ ((〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 11 | 4, 6, 10 | sylancr 588 | . . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 12 | 11 | rgen 3052 | . 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦) |
| 13 | dffo3 7047 | . 2 ⊢ ( |s : <<s –onto→ No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))) | |
| 14 | 1, 12, 13 | mpbir2an 712 | 1 ⊢ |s : <<s –onto→ No |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∈ wcel 2114 ∀wral 3050 ∃wrex 3059 〈cop 4585 class class class wbr 5097 ⟶wf 6487 –onto→wfo 6489 ‘cfv 6491 (class class class)co 7358 No csur 27609 <<s csslt 27755 |s cscut 27757 L cleft 27821 R cright 27822 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2183 ax-ext 2707 ax-rep 5223 ax-sep 5240 ax-nul 5250 ax-pow 5309 ax-pr 5376 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2932 df-ral 3051 df-rex 3060 df-rmo 3349 df-reu 3350 df-rab 3399 df-v 3441 df-sbc 3740 df-csb 3849 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-pss 3920 df-nul 4285 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-uni 4863 df-int 4902 df-iun 4947 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6258 df-ord 6319 df-on 6320 df-suc 6322 df-iota 6447 df-fun 6493 df-fn 6494 df-f 6495 df-f1 6496 df-fo 6497 df-f1o 6498 df-fv 6499 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-1o 8397 df-2o 8398 df-no 27612 df-slt 27613 df-bday 27614 df-sslt 27756 df-scut 27758 df-made 27823 df-old 27824 df-left 27826 df-right 27827 |
| This theorem is referenced by: (None) |
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